package com.zsy.test.jm2;





import java.security.MessageDigest;

public class MD5Util {
	
	 public static final String MD5(String s)
	   {
	     char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };
	     try {
	       byte[] strTemp = s.getBytes();
	       MessageDigest mdTemp = MessageDigest.getInstance("MD5");
	       mdTemp.update(strTemp);
	       byte[] md = mdTemp.digest();
	       int j = md.length;
	       char[] str = new char[j * 2];
	       int k = 0;
	       for (int i = 0; i < j; i++) {
	         byte byte0 = md[i];
	         str[(k++)] = hexDigits[(byte0 >>> 4 & 0xF)];
	         str[(k++)] = hexDigits[(byte0 & 0xF)];
	       }
	       return new String(str); } catch (Exception e) {
	     }
	     return null;
	   }

	private static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++)
			resultSb.append(byteToHexString(b[i]));

		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n += 256;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static String MD5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (charsetname == null || "".equals(charsetname))
				resultString = byteArrayToHexString(md.digest(resultString
						.getBytes()));
			else
				resultString = byteArrayToHexString(md.digest(resultString
						.getBytes(charsetname)));
		} catch (Exception exception) {
		}
		return resultString;
	}

	private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

}
